https://bugzilla.kernel.org/show_bug.cgi?id=70651
--- Comment #7 from Alex Deucher <alexdeucher at gmail.com> --- That patch is against 3.14rc; it should apply there. The issue is that on hybrid laptops, the dGPU is powered down when not in use so you can't make adjustments to the dGPU when it's powered down. It doesn't make sense to power it up to make the adjustments since it will just be powered down again right after. As such the values you are reading back are garbage since the hw is powered down. The patch just attempts to do something sensible when you try and access the hw via sysfs or debugfs and the dGPU is powered down. You can disable the automatic dGPU power down by setting radeon.runpm=0 on the kernel command line in grub. -- You are receiving this mail because: You are watching the assignee of the bug.
